Both are a mystery to me. What is FTM mode? Download mode almost sounds like it could be a method to update the os from a ZTE update. That is very similar to how the old LG Optimus M could be reset if bricked.

 

Field test mode - essentially, booting into the bootloader in fastboot mode, usually.

 

On LG Motion 4G, Download mode is what we use to USB connect to a pc and factory restore the /system. (revert back to stock from a rooted phone)

 

Just to let everybody know what I've found:

Holding Vol down + power goes to FTM mode

Holding Vol up + power goes to Android Recovery

Holding Vol up + Vol down with power goes to a third mode where the screen stays black and the status LED stays on red. According to my computer, this is DFU mode. I have no clue what this is for, but with a little more googling, I'll update on that.

 

Just letting you all know, just about every phone has these modes nowadays.

 

True but they vary a lot by make.

 

Vary by model

 

Just to update if anyone looks to this as a reference, DFU mode is Device Firmware Update. Its used for when the recovery mode doesn't work.